[Bug target/44578] GCC generates MMX instructions but fails to generate "emms"

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44578

--- Comment #8 from Uros Bizjak <ubizjak at gmail dot com> 2013-04-29 17:13:30 UTC ---
Please try following patch, it fixes the testcase for me (note "!" for ?*y
alternative):

--cut here--
Index: i386.md
===================================================================
--- i386.md     (revision 198401)
+++ i386.md     (working copy)
@@ -3049,10 +3049,10 @@

 (define_insn "*zero_extendsidi2"
   [(set (match_operand:DI 0 "nonimmediate_operand"
-                       "=r,?r,?o,r   ,o,?*Ym,?*y,?*Yi,?*x")
+                       "=r,?r,?o,r   ,o,?*Ym,?!*y,?*Yi,?*x")
        (zero_extend:DI
         (match_operand:SI 1 "x86_64_zext_operand"
-                       "0 ,rm,r ,rmWz,0,r   ,m  ,r   ,m")))]
+                       "0 ,rm,r ,rmWz,0,r   ,m   ,r   ,m")))]
   ""
 {
   switch (get_attr_type (insn))
--cut here--